package kr.hkit.powerjava.chapter25.chat;

public class QuizeProtocol {
	private static final int WAITING = 0;
	private static final int PROBLEM = 1 ;
	private static final int ANSWER = 2;
	
	private static final int NUMPROBLEM = 3;
	
	private int state = QuizeProtocol.WAITING;
	private int currentProblem = 0;  //현재 문제 번호
	
	private String[] problem = {
			"네트워크 처리 페키지는 ? ",
			"자바 최신 버전은?",
			"인터넷에서 컴퓨터를 식별하는 주소는 ?"
	};
	private String[] answers = {"java.io" , "1.7" , "IP 주소"};
	
	public String process(String theInput){
		String theOutput= null;
		
		switch(state){
			case QuizeProtocol.WAITING:
				theOutput = "퀴즈를 시작합니다(y/n)";
				state = QuizeProtocol.PROBLEM;
				break;
			case QuizeProtocol.PROBLEM:
				if (theInput.equalsIgnoreCase("y")){
					theOutput = problem[currentProblem];
					state = QuizeProtocol.ANSWER;
				}else{
					state = QuizeProtocol.WAITING;
					theOutput = "quit";
				}
				break;
			case QuizeProtocol.ANSWER:
				if(theInput.equalsIgnoreCase(answers[currentProblem])){
					theOutput = "정답입니다. 계속하시겠습니까?(y/n)";
					state=QuizeProtocol.PROBLEM;
				}else{
					theOutput = "오답입니다. 계속하시겠습니까?(y/n)";
					state=QuizeProtocol.PROBLEM;
				}
				currentProblem = (currentProblem+1)%NUMPROBLEM;
				break;
		}
		return theOutput;
	}
	
}
